Q.

Which of the following bacterium causes crown gall disease in plants?

A. Bacillus thurigiensis
B. Agrobacterium tumefaciens
C. Pseudomonas fluorescens
D. None of these
Answer» B. Agrobacterium tumefaciens
Explanation: Crown gall is a disease caused by the bacterium Agrobacterium tumefaciens (synonym Rhizobium radiobacter), which enters the plant through wounds in roots or stems and stimulates the plant tissues to grow in a disorganized way, producing swollen galls. As the disease progresses, plants lose vigour and may eventually die.
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